Elevated level of nerve growth factor in the bladder pain syndrome/interstitial cystitis: a meta-analysis.

Objectives: To elucidate the association between nerve growth factor (NGF) level and bladder pain syndrome/interstitial cystitis (BPS/IC) by conducting a meta-analysis.

Methods: We conducted a systematic literature search to identify original studies of NGF level in BPS/IC before November 2015. Eligible studies were retrieved via both computer searches and manual review of references.